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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: SaveCommand.html 671 2015-01-17 15:50:55Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.cli.cmd;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.collect.Iterables;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Lists;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.io.BufferedOutputStream;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.io.File;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.io.IOException;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.ArrayList;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.Map;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.util.regex.Matcher;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import javax.xml.stream.XMLOutputFactory;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import javax.xml.stream.XMLStreamWriter;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.dellroad.stuff.io.AtomicUpdateFileOutputStream;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.dellroad.stuff.xml.IndentXMLStreamWriter;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.jsimpledb.JObject;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.jsimpledb.cli.CliSession;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.jsimpledb.core.ObjId;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.jsimpledb.parse.ParseContext;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.jsimpledb.parse.ParseException;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.jsimpledb.parse.ParseSession;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.jsimpledb.parse.Parser;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.jsimpledb.parse.expr.Node;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.jsimpledb.parse.expr.Value;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.jsimpledb.parse.util.ParseCastFunction;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.jsimpledb.parse.util.StripPrefixFunction;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.jsimpledb.util.XMLObjectSerializer;<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>import jline.console.completer.FileNameCompleter;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>@Command<a name="line.40"></a>
<span class="sourceLineNo">041</span>public class SaveCommand extends AbstractCommand {<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    public SaveCommand() {<a name="line.43"></a>
<span class="sourceLineNo">044</span>        super("save --storage-id-format:storageIdFormat file.xml:file expr:expr");<a name="line.44"></a>
<span class="sourceLineNo">045</span>    }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>    @Override<a name="line.47"></a>
<span class="sourceLineNo">048</span>    public String getHelpSummary() {<a name="line.48"></a>
<span class="sourceLineNo">049</span>        return "exports objects to an XML file";<a name="line.49"></a>
<span class="sourceLineNo">050</span>    }<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>    @Override<a name="line.52"></a>
<span class="sourceLineNo">053</span>    public String getHelpDetail() {<a name="line.53"></a>
<span class="sourceLineNo">054</span>        return "Evaluates the expression, which must evaluate to an Iterator (or Iterable) of database objects,"<a name="line.54"></a>
<span class="sourceLineNo">055</span>          + " and writes the objects to the specified XML file. Objects can be read back in later via `load'.";<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    @Override<a name="line.58"></a>
<span class="sourceLineNo">059</span>    protected Parser&lt;?&gt; getParser(String typeName) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>        return "file".equals(typeName) ? new FileParser() : super.getParser(typeName);<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>    @Override<a name="line.63"></a>
<span class="sourceLineNo">064</span>    public CliSession.Action getAction(CliSession session, ParseContext ctx, boolean complete, Map&lt;String, Object&gt; params) {<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>        // Parse parameters<a name="line.66"></a>
<span class="sourceLineNo">067</span>        final boolean nameFormat = !params.containsKey("storageIdFormat");<a name="line.67"></a>
<span class="sourceLineNo">068</span>        final File file = (File)params.get("file.xml");<a name="line.68"></a>
<span class="sourceLineNo">069</span>        final Node expr = (Node)params.get("expr");<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>        // Return action<a name="line.71"></a>
<span class="sourceLineNo">072</span>        return new CliSession.Action() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>            @Override<a name="line.73"></a>
<span class="sourceLineNo">074</span>            public void run(CliSession session) throws Exception {<a name="line.74"></a>
<span class="sourceLineNo">075</span>                final Value value = expr.evaluate(session);<a name="line.75"></a>
<span class="sourceLineNo">076</span>                final Iterable&lt;?&gt; i = value.checkType(session, "save", Iterable.class);<a name="line.76"></a>
<span class="sourceLineNo">077</span>                final AtomicUpdateFileOutputStream updateOutput = new AtomicUpdateFileOutputStream(file);<a name="line.77"></a>
<span class="sourceLineNo">078</span>                final BufferedOutputStream output = new BufferedOutputStream(updateOutput);<a name="line.78"></a>
<span class="sourceLineNo">079</span>                boolean success = false;<a name="line.79"></a>
<span class="sourceLineNo">080</span>                final int count;<a name="line.80"></a>
<span class="sourceLineNo">081</span>                try {<a name="line.81"></a>
<span class="sourceLineNo">082</span>                    final XMLStreamWriter writer = new IndentXMLStreamWriter(<a name="line.82"></a>
<span class="sourceLineNo">083</span>                      XMLOutputFactory.newInstance().createXMLStreamWriter(output, "UTF-8"));<a name="line.83"></a>
<span class="sourceLineNo">084</span>                    writer.writeStartDocument("UTF-8", "1.0");<a name="line.84"></a>
<span class="sourceLineNo">085</span>                    count = new XMLObjectSerializer(session.getTransaction()).write(writer, nameFormat,<a name="line.85"></a>
<span class="sourceLineNo">086</span>                      Iterables.transform(i, new ParseCastFunction&lt;ObjId&gt;(ObjId.class) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>                        @Override<a name="line.87"></a>
<span class="sourceLineNo">088</span>                        public ObjId apply(Object obj) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>                            return obj instanceof JObject ? ((JObject)obj).getObjId() : super.apply(obj);<a name="line.89"></a>
<span class="sourceLineNo">090</span>                        }<a name="line.90"></a>
<span class="sourceLineNo">091</span>                      }));<a name="line.91"></a>
<span class="sourceLineNo">092</span>                    success = true;<a name="line.92"></a>
<span class="sourceLineNo">093</span>                } finally {<a name="line.93"></a>
<span class="sourceLineNo">094</span>                    if (success) {<a name="line.94"></a>
<span class="sourceLineNo">095</span>                        try {<a name="line.95"></a>
<span class="sourceLineNo">096</span>                            output.close();<a name="line.96"></a>
<span class="sourceLineNo">097</span>                        } catch (IOException e) {<a name="line.97"></a>
<span class="sourceLineNo">098</span>                            // ignore<a name="line.98"></a>
<span class="sourceLineNo">099</span>                        }<a name="line.99"></a>
<span class="sourceLineNo">100</span>                    } else<a name="line.100"></a>
<span class="sourceLineNo">101</span>                        updateOutput.cancel();<a name="line.101"></a>
<span class="sourceLineNo">102</span>                }<a name="line.102"></a>
<span class="sourceLineNo">103</span>                session.getWriter().println("Wrote " + count + " objects to `" + file + "'");<a name="line.103"></a>
<span class="sourceLineNo">104</span>            }<a name="line.104"></a>
<span class="sourceLineNo">105</span>        };<a name="line.105"></a>
<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span>// FileParser<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    private class FileParser implements Parser&lt;File&gt; {<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>        @Override<a name="line.112"></a>
<span class="sourceLineNo">113</span>        public File parse(ParseSession session, ParseContext ctx, boolean complete) {<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>            // Get filename<a name="line.115"></a>
<span class="sourceLineNo">116</span>            final Matcher matcher = ctx.tryPattern("[^\\s;]*");<a name="line.116"></a>
<span class="sourceLineNo">117</span>            if (matcher == null)<a name="line.117"></a>
<span class="sourceLineNo">118</span>                throw new ParseException(ctx);<a name="line.118"></a>
<span class="sourceLineNo">119</span>            final String path = matcher.group();<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>            // Check file<a name="line.121"></a>
<span class="sourceLineNo">122</span>            final File file = new File(path);<a name="line.122"></a>
<span class="sourceLineNo">123</span>            if (file.isDirectory() || (!file.exists() &amp;&amp; complete)) {<a name="line.123"></a>
<span class="sourceLineNo">124</span>                final ArrayList&lt;CharSequence&gt; list = new ArrayList&lt;&gt;();<a name="line.124"></a>
<span class="sourceLineNo">125</span>                final int index = new FileNameCompleter().complete(path, path.length(), list);<a name="line.125"></a>
<span class="sourceLineNo">126</span>                throw new ParseException(ctx, "can't write to file `" + path + "'").addCompletions(<a name="line.126"></a>
<span class="sourceLineNo">127</span>                  Lists.transform(Lists.transform(list, new ParseCastFunction&lt;String&gt;(String.class)),<a name="line.127"></a>
<span class="sourceLineNo">128</span>                    new StripPrefixFunction(path.substring(index))));<a name="line.128"></a>
<span class="sourceLineNo">129</span>            }<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span>            // Done<a name="line.131"></a>
<span class="sourceLineNo">132</span>            return file;<a name="line.132"></a>
<span class="sourceLineNo">133</span>        }<a name="line.133"></a>
<span class="sourceLineNo">134</span>    }<a name="line.134"></a>
<span class="sourceLineNo">135</span>}<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>




























































</pre>
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